Johnson, Ralph L.
YMCA pool operations manual / Ralph L. Johnson - Second edition - 143 pages ;. illustrations ; 23 cm
0873226569
Swimming pools--Handbooks, manuals, etc.
363.7292
YMCA pool operations manual / Ralph L. Johnson - Second edition - 143 pages ;. illustrations ; 23 cm
0873226569
Swimming pools--Handbooks, manuals, etc.
363.7292